bo.ser denotes grapes before full ripening, whether in vineyard growth or in sayings about eating them.

The term denotes grapes before full ripening: Isaiah 18:5 places them before the harvest, while Ezekiel 18:2, Jeremiah 31:29, and Jeremiah 31:30 use their eating in a proverb about teeth being set on edge.

1. Grapes before full ripening · dominant

   In Isaiah 18:5, the singular absolute noun occurs in a before-harvest scene, where the APB renders the clause "when the flower is finished and the unripe grape is weaned." In Ezekiel 18:2, Jeremiah 31:29, and Jeremiah 31:30, the same singular absolute form is the thing fathers or persons eat in the saying that teeth are set on edge; the APB varies between "unripe grapes" and "sour grapes."

   Isaiah 18:5Ezekiel 18:2Jeremiah 31:29Jeremiah 31:30

In the Anselm Project Bible: The APB presents the term as "unripe grape" in Isaiah 18:5 and "unripe grapes" in Ezekiel 18:2, but as "sour grapes" in Jeremiah 31:29 and Jeremiah 31:30. This variation does not establish separate senses.